The product can mount your mobile device securely on your car while you are charging. At the same time, it has two charging ports, one for 1A (cell phone), one for 2A (tablet PC), which can provide more convenience to the users, also you can plug another usb car charger into the slot, that means it's a 3 USB car charger mount! The LED light indicator can show the status and make its using much more easily. Also, as a dual sub charger, it can charge two phones at once, (one for 1A, and one for 1A or 2A).